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https://issues.apache.org/jira/browse/YARN-8675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590499#comment-16590499
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Eric Yang commented on YARN-8675:
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[~billie.rinaldi] When net != host, AM must set the hostnames for containers.
Randomly generated hostname will not work across nodes.
> Setting hostname of docker container breaks with "host" networking mode for
> Apps which do not run as a YARN service
> -------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-8675
> URL: https://issues.apache.org/jira/browse/YARN-8675
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Yesha Vora
> Assignee: Suma Shivaprasad
> Priority: Major
> Labels: Docker
>
> Applications like the Spark AM currently do not run as a YARN service and
> setting hostname breaks driver/executor communication if docker version
> >=1.13.1 , especially with wire-encryption turned on.
> YARN-8027 sets the hostname if YARN DNS is enabled. But the cluster could
> have a mix of YARN service/native Applications.
> The proposal is to not set the hostname when "host" networking mode is
> enabled.
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